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Generally, aneuploidies are caused by the impaired assortment of chromosomes during meiosis. For example, they are caused when the homologous chromosomes of pair 21 do not separate and, therefore, gametes with two chromosomes 21 and gametes without chromosomes 21 are formed. If a gamete with two chromosomes 21 fertilizes a normal gamete of the opposite sex, the zygote will present trisomy (three chromosomes 21). If a gamete without chromosomes 21 fertilizes a normal gamete of the opposite sex, it will result in a zygote with monosomy (only one chromosome 21).
What is the cause of aneuploidies?
What is the difference between reproductive and therapeutic cloning? Name one limitation for each technique. Make sure to differentiate between pluripotent and totipotent embryonic stem cells as well as adult and embryonic stem cells.
Briefly explain the Lyon hypothesis and how this hypothesis explains various cytological and phenotypic observations in female mammals.
In a fictional population of bullfrogs in a lake, there are 300 mature females and 300 mature males. However, only 50 of those males hold territories (and thus, are reproductive) and a further 20 of those males employ the sneaker tactic (and thus,..
Bacteriophage M13 infects E. coli differently from the way bacteriophage T2 does. The M13 coat is removed in the inner membrane of the bacterial cell, where it is sequestered during phage replication.
Describe why the Q Cycle hypothesis was proposed and what, if any, experimental evidence exists to support such a cycling of hydroquinone.
What prevents the ends of chromosomes from getting shorter and shorter with each round of replication?
How can a normal cell become malignant? what is the risk fators?
A piece of DNA has unwound and the ends of the two strands have begun separating for replication.Describe in specific detail the discontinuous synthesis of the the lagging strand. Draw a simple diagram, with the 3' and 5' ends labeled, to show tha..
Histone proteins are proteins that are involved in the supercoilingof DNA within cells. Essentially, DNA is wound tightly around these histone proteins tosave space until the DNA needs to be accessed.
During strenuous exercise, the demand for ATP in skeletal muscleis greatly increased. In rabbits, most ATP is made by lactic acidfermentation. ATP is made at the substrate level phosphorylations,using phosphoglycerate kinase and pyruvate kinase.
Describe the pathophysiology and consequences associated with varicose veins and chronic venous insufficiency, venous and arterial thrombus formation, aneurysms, embolisms, Buerger's disease, Raynaud's disease, arteriosclerosis, and atherosclerosi..
The E. coli gene lacYencodes a protein called lactose permease, Reversion, Intragenic suppressor, Intergenic suppressor, Missense mutation
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